Patek Philippe CHR 27-525 PS Q

Caliber CHR 27-525-PS-Q is a hand-wound split-seconds monopusher chronograph with perpetual calendar, manufactured by Patek Philippe. It measures 27.3 mm in diameter and 7.3 mm thick, beats at 21,600 vph, and delivers 38 to 48 hours of power reserve with 31 jewels. The movement features Gyromax shock protection and a Breguet balance spring, with day, month, leap year and day/night indications displayed in apertures, a hand-date, moon phase, and small seconds. It bears the Patek Philippe Seal and is used in the Perpetual Calendar Split-Seconds Chronograph references 5951 and 5372.